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Red Hat 6 RHSA-2015:1768-01 Low Severity: Libunwind Off-By-One Issue

red hat
Calendar Grey September 10, 2015
Dist Redhat Esm H88
The advisory from Red Hat concerns a minor libunwind modification for RHEL 6, rectifying an off-by-one mistake within the API.
Updated libunwind packages that fix one security issue are now available for Red Hat Enterprise Linux OpenStack Platform 5.0 for Red Hat Enterprise Linux 6

Solution

Before applying this update, make sure all previously released errata relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

Summary

Libunwind provides a C ABI to determine the call-chain of a program.
An off-by-one array indexing error was found in the libunwind API, which could cause an error when reading untrusted binaries or dwarf debug info data. Red Hat products do not call the API in this way; and it is unlikely that any exploitable attack vector exists in current builds or supported usage. (CVE-2015-3239)
This issue was discovered by Paolo Bonzini of Red Hat.
All users of libunwind are advised to upgrade to these updated packages, which contain a backported patch to correct this issue.

Topics%20covered

Topics Covered

security advisory security update Red Hat low impact libunwind

References

https://access.redhat.com/security/cve/CVE-2015-3239 https://access.redhat.com/security/updates/classification/#low

Package List

Red Hat Enterprise Linux OpenStack Platform 5.0 for RHEL 6:
Source: libunwind-1.1-4.1.el6ost.src.rpm
x86_64: libunwind-1.1-4.1.el6ost.x86_64.rpm libunwind-debuginfo-1.1-4.1.el6ost.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/


Severity
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Advisory ID: RHSA-2015:1768-01
Product: Red Hat Enterprise Linux OpenStack Platform
Advisory URL: https://access.redhat.com/errata/RHSA-2015:1768.html
Issue date: 2015-09-10

Topic

Updated libunwind packages that fix one security issue are now availablefor Red Hat Enterprise Linux OpenStack Platform 5.0 for Red Hat EnterpriseLinux 6.Red Hat Product Security has rated this update as having Low securityimpact. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available from the CVE link in theReferences section.

Topics%20covered

Topics Covered

security advisory security update Red Hat low impact libunwind

Relevant Releases Architectures

Red Hat Enterprise Linux OpenStack Platform 5.0 for RHEL 6 - x86_64

Bugs Fixed

1232265 - CVE-2015-3239 libunwind: off-by-one in dwarf_to_unw_regnum()

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